Sad-iron heat-regulator.



F. BERNARDI.

SAD momv HEAT REGULATOR.

APPLICATION FILED JULY @1915.

Pnientedbept. 26, 1916.

s I if l y INVEN'FOR FRANK BERNARDI, OF STOCKTON, CALIFORNIA.

SAD-IRON HEAT-REGULATOR.

Specification of Letters Patent.

Patented Sept. 26, 1916.

Application led Ju'ly 6, 1915. Serial No. 38,163.

To all whom it may con/'ern Be it known that I, FRANK BERNARDI, acitizen of the United States, residing at Stockton, in the county of SanJoaquin and State of California, have invented new and usefulImprovements in Sad Iron Heat- Regulators, of which the following is aspecification.

This invention relates to a mechanism which is especially designed toregulate and control the temperature of electrically heated implementssuch as sad irons and the li e.

It consists of a metallic support which is expansible by the heatconveyed to it from the electrically heated iron which rests upon it,means to multiply the movement caused by the expansion and an automaticswitch which is controlled by the expansion and the multiplying means.

It also includes means by which any desired degree may be maintained bythe operation of the switch actuating mechanism, and details ofconstruction all of which will be more fully described by reference tothe accompanying drawings in which- Figure 1 is a plan. Fig. 2 is adetail vertical longitudinal section on line 2 2 of Fig. 1. Fig. 3 is adetail vertical transverse section on line 3-3 of Fig. 1.

It is desirable and necessary in order to produce good work that sadirons be heated to, and maintained at certain temperatures, and it isthe object of this invention to determine such temperature, and toautomatically regulate it within desired limits and thus prevent injuryto the work to be done.

As shown in the drawings A is a base upon which may be fixed a fiber orasbestos sheet 2, and upon this is secured a metal frame 3. Upon thisframe may be secured an asbestos sheet 4, which serves to support themetal expansible plate 5. This plate is bolted to the above support, atone end, while the opposite end is free to expand or contract, byvariation of the heat applied to it.

An electrically heated iron 5a is adapted to rest upon the plate 5 andthe heat generated within the iron is communicated to the plate and thusexpands and extends it in the direction of its free end.

7 is a lever fulcrumed at 8. and having its short arm connected at 9 tothe plate 5. The other arm of the lever is enough longer than this firstarm, to considerably increase the movement caused by the expansion ofthe plate 5. By means of this lever and the following mechanism the heatcontrol Vris effected.

Electric current is supplied from any suitable source to the bindingposts 10 and thence through a suitable socket, and cord connection tothe implement and its resistance coils1 thus heating it. A main switchlever 11 serves to open or close the circuit.

12 is a conductor terminating in a guide 13 in which and a companionguide lil, a bar 14 is slidable. This bar carries at one end, a contactmember 15 which abut-s against the companion contact 16, as shown. Theother conductor 12a connects the switch 11 with the point 16, and whenthe bar 14 is in contact with 16 the electric circuit is completedthrough these members and also through the iron 5a.

The members 14 and 16 are normally held in contact by a spring 17 whichexerts a constant pressure against the member 14. By means of a yscrew18 the tension of this spring, and the consequent pressure of the member14 against 16 may be varied, or the circuit broken altogether. The bar14 has an upturned part 19, through which passes a screw 20, the pointof which may act against the outer movable end of the lever 7.

. This screw is adjusted so that when the desired temperature of theimplement has been reached, the expansion of the plate 5 acts throughthe lever 7, the outer end of which is thus moved until it contacts withthe screw 20 and moves itand the bar 14 back, soI as to disengage thelatter from the member 16, and cut ofi' the electric current through theimplement. The screw 20 may be so adjusted as to determine the heat ofthe iron by the temperature at which the points 14 and 16 are separated.The member 16 may preferably have a replaceable contact 16 which may berenewed whenever worn out.

By means of this apparatus, I am enabled to adjust and maintain thedesired temperature with but little attention.

Various modifications in construction may be made without departing fromthe essential features of this invention.

Having thus described my invention, what I claim and desire to secure byLetters Patent is- 1. In combination with a support including a plateexpansible and contractible in response to temperature variations, anarm extending outwardly from the plate, a lever lli pivoted at one endto the support and pivotally connected between its ends to said arm, aslidable spring tensioned contact carrying bar on the su port, astationary Contact on the support or engagement with the bar contact,and an abutment on the bar for engagement with the opposite end of thelever.

2. In combination with a support including,r a member expansible andcontractible in response to temperature variations, a switch including aslidable contact, and a pivoted lever engageable with the slidingcontact and connected to the member whereby upon heating of the memberabove a predetermined point the lever will be moved to engage the switchand open the latter.

3. In a device of the type set forth, a. base, insulating materialthereon, an expansible metal plate on said insulating material havingone end rigidly secured to the base and FRANK BERNARDI.

Witnesses:

W. W. HEALEY, M. E. EWING.

